Was Prepared to Not Like This Movie (spoilers)
I read Symond's book several weeks before watching Midway. I found the movie to be very factual compared to the book. As far as I can tell, just about everything that happened in the movie also happened in the book. I'm certain that various details used to flesh out the characters were invented by the screen writers, but the movie is faithful to history.
My biggest gripe is that it tries to tell too much; from the Pearl Harbor attack, to Coral Sea to the Doolittle Raid and then to Midway. All of these battles can be their own movie and have been.
The small amount of footage of the Dolittle raid was more accurate than the trash depicted in the movie Pearl Harbor.
The Japanese are shown war gaming the attack with senior officers refusing to believe that the Americans would not be surprised.
The movie depicts the US Army planes attacking from Midway as ineffective at bombing ships; their glide bombing technique failed to do any damage.
The American torpedoes were shown accurately as 100% duds although a single PBY did manage to score one hit on a tanker with a torpedo; not shown on screen.
It does show Nagumo's dilemma in regards to equipping his planes for land or sea attacks. It also touches on how vulnerable his carriers were to attack while fueling and arming planes in the hanger bay.
The plight of the Zero with their limited ammo load and requirement to frequently land to re-arm was barely touched upon although it does shown a pilot with empty tanks looking down on his burning carrier. The effect of the suicidal American torpedo plane attacks keeping the Zero CAP occupied while the dive bombers sunk the carriers was barely seen.
One scene shows an American officer and enlisted man plucked out of the ocean by a Japanese destroyer. When the enlisted man refuses to talk, he is thrown overboard with an anchor tied to his legs. This seems to be related to the violent interrogation of Ensign Osmus who gave up vital information (according to Japanese records found after the war) prior to be thrown overboard.
The night carrier landings with the risky lighting of the Enterprise was not shown.
It shows Ensign Gay's ringside seat to the battle after he was shot down.
Best's three plane attack on the Akagi was shown to be under fierce AA fire, actually the Japanese anti aircraft gunners only got off a few shots before the planes bombed them. It does show only one direct hit on the Akagi by LT. Best that sunk the carrier.
For some reason it does not show how fogging of the dive bomber wind screens was a constant problem for the bombers until they learned to open up their canopy a bit.
Lt. Best is shown successfully glide bombing across the flight deck of the Hiryu. He most likely dive bombed and possibly hit it with one bomb. It does accurately depict him inhaling caustic soda from his oxygen bottle which injured him enough to be hospitalized a month later and eventually discharged.